SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91c6c07f84575c5984c65b1663629505aff2ed497c4433d81f64a1859b4a3e5c' 
  AND token = 'sBxl2uh9EH4GqI1uvZg14WMSNt8QgJoSDbJTsh8xz6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}